CPM Homework Help : AC Problem 3-85

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Home > AC > Chapter 3 > Lesson 3.2.2 > Problem 3-85

3-85.

Stoplight icon For each equation, a possible solution is given. Check to see if the given solution is correct. Homework Help ✎

$3x+7=x−1,\ \text{solution}\ x=−4?$
Hint (a):
Substitute the possible answer for $x$ .
$3(−4)+7=(−4)−1$
More Help (a):
If the numbers on both sides of the equation sign are true, then the possible answer is correct.
$−12+7=−5$
$−5=−5$
Answer (a):
Yes

$−2x − 4 = −4x + 3,\ \text{solution}\ x = 3?$
Hint (b):
Follow the steps in part (a).
Answer (b):
No

$−3x + 5 + 5x − 1 = 0,\ \text{solution}\ x = 2?$
Hint (c):
Follow the steps in part (a).

$−(x − 1) = 4x − 5 − 3x,\ \text{solution}\ x = 3?$
Hint (d):
How does the negative in front of the parentheses change what is inside?
More Help (d):
Follow the steps in part (a).

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